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152 lines
4.0 KiB
152 lines
4.0 KiB
// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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// Licensed under the MIT License:
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#ifndef KJ_MINIPOSIX_H_
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#define KJ_MINIPOSIX_H_
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// This header provides a small subset of the POSIX API which also happens to be available on
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// Windows under slightly-different names.
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#if defined(__GNUC__) && !KJ_HEADER_WARNINGS
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#pragma GCC system_header
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#endif
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#if _WIN32
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#include <io.h>
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#include <direct.h>
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#include <fcntl.h> // _O_BINARY
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#else
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#include <limits.h>
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#include <errno.h>
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#endif
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#if !_WIN32 || __MINGW32__
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#endif
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#if !_WIN32
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#include <sys/uio.h>
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#endif
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namespace kj {
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namespace miniposix {
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#if _WIN32 && !__MINGW32__
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// We're on Windows and not MinGW. So, we need to define wrappers for the POSIX API.
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typedef int ssize_t;
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inline ssize_t read(int fd, void* buffer, size_t size) {
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return ::_read(fd, buffer, size);
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}
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inline ssize_t write(int fd, const void* buffer, size_t size) {
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return ::_write(fd, buffer, size);
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}
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inline int close(int fd) {
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return ::_close(fd);
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}
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#ifndef F_OK
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#define F_OK 0 // access() existence test
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#endif
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#ifndef S_ISREG
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#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG) // stat() regular file test
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#endif
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#ifndef S_ISDIR
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#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR) // stat() directory test
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#endif
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#ifndef STDIN_FILENO
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#define STDIN_FILENO 0
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO 1
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#endif
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#ifndef STDERR_FILENO
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#define STDERR_FILENO 2
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#endif
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#else
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// We're on a POSIX system or MinGW which already defines the wrappers for us.
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using ::ssize_t;
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using ::read;
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using ::write;
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using ::close;
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#endif
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#if _WIN32
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// We're on Windows, including MinGW. pipe() and mkdir() are non-standard even on MinGW.
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inline int pipe(int fds[2]) {
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return ::_pipe(fds, 8192, _O_BINARY);
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}
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inline int mkdir(const char* path, int mode) {
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return ::_mkdir(path);
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}
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#else
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// We're on real POSIX.
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using ::pipe;
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using ::mkdir;
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inline size_t iovMax(size_t count) {
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// Apparently, there is a maximum number of iovecs allowed per call. I don't understand why.
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// Most platforms define IOV_MAX but Linux defines only UIO_MAXIOV and others, like Hurd,
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// define neither.
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//
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// On platforms where both IOV_MAX and UIO_MAXIOV are undefined, we poke sysconf(_SC_IOV_MAX),
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// then try to fall back to the POSIX-mandated minimum of _XOPEN_IOV_MAX if that fails.
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//
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// http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html#tag_13_23_03_01
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#if defined(IOV_MAX)
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// Solaris (and others?)
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return IOV_MAX;
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#elif defined(UIO_MAXIOV)
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// Linux
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return UIO_MAXIOV;
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#else
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// POSIX mystery meat
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long iovmax;
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errno = 0;
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if ((iovmax = sysconf(_SC_IOV_MAX)) == -1) {
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// assume iovmax == -1 && errno == 0 means "unbounded"
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return errno ? _XOPEN_IOV_MAX : count;
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} else {
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return (size_t) iovmax;
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}
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#endif
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}
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#endif
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} // namespace miniposix
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} // namespace kj
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#endif // KJ_MINIPOSIX_H_
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